Isometric tiles now render the entire screen. Off screen tiles will not be rendered.

code/redalert/cell.cpp

@@ -1008,10 +1008,12 @@ void CellClass::ConvertCoordsToIsometric(int& x, int& y) {
 	y = sy;// + (CELL_PIXEL_W / 2);
 
 	x = x + (ScreenWidth / 2);
+	y = y - (ScreenWidth / 4);
 }
 
 bool CellClass::ScreenCoordsToIsoTile(int x, int y, int &tileX, int &tileY) {	
 	x = x - (ScreenWidth / 2);
+	y = y + (ScreenWidth / 4);
 
 	float tempPt_x = (2 * y + x) / 2;
 	float tempPt_y = (2 * y - x) / 2;

code/redalert/display.cpp

@@ -571,10 +571,10 @@ short const * DisplayClass::Text_Overlap_List(char const * text, int x, int y) c
 void DisplayClass::Set_View_Dimensions(int x, int y, int width, int height)
 {
 	if (width == -1) width = SeenBuff.Get_Width();
-	TacLeptonWidth = Pixel_To_Lepton( width - x) * 2;
+	TacLeptonWidth = Pixel_To_Lepton( width - x) * 2.5;
 
 	if (height == -1) height = SeenBuff.Get_Height();
-	TacLeptonHeight = Pixel_To_Lepton(height - y) * 2;
+	TacLeptonHeight = Pixel_To_Lepton(height - y) * 4;
 
 	/*
 	**	Adjust the tactical cell if it is now in an invalid position

code/redalert/newblit.cpp

@@ -25,6 +25,14 @@ void GL_ResetClipRect(void) {
 }
 
 void GL_RenderImage(Image_t* image, int x, int y, int width, int height, int colorRemap, int shapeId) {
+	if(x < 0 || y < 0) {
+		return;
+	}
+
+	if(x >= ScreenWidth || y >= ScreenHeight) {
+		return;
+	}
+
 	ImVec2 mi(x, y);
 	ImVec2 ma(x + width, y + height);